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Net Income Per Share Information (Basic and Diluted Net Income Per Common Share) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Numerator: |  |
Net income attributable to Waste Connections for basic and diluted earnings per share | $ 14,874 | $ 44,842
Denominator: |  |
Basic shares outstanding | 175,374,630 | 122,778,290
Dilutive effect of warrants | 42,218 | 27,383
Dilutive effect of restricted share units | 518,634 | 644,911
Diluted shares outstanding | 175,935,482 | 123,450,584

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